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来源：互联网发布：oracle表索引优化编辑：程序博客网时间：2024/05/02 04:22

void GameScene::drawCicle()
{
Size visibleSize = Director::getInstance()->getVisibleSize();
Point origin = Director::getInstance()->getVisibleOrigin();
//创建cliper
ClippingNode* pClip=ClippingNode::create();
pClip->setInverted(true);
addChild(pClip);
//添加底板
LayerColor* pColor = LayerColor::create(Color4B(0,0,0,200));
pClip->addChild(pColor);

//绘制圆形区域
static Color4F green = Color4F::GREEN;//顶点颜色,这里我们没有实质上没有绘制,所以看不出颜色
float fRadius=50.0f;//圆的半径
const int nCount=100;//圆形其实可以看做正多边形,我们这里用正100边型来模拟园
const float coef = 2.0f * (float)M_PI/nCount;//计算每两个相邻顶点与中心的夹角
static CCPoint circle[nCount];//顶点数组
for(unsigned int i = 0;i <nCount; i++) {
float rads = i*coef;//弧度
circle[i].x = fRadius * cosf(rads);//对应顶点的x
circle[i].y = fRadius * sinf(rads);//对应顶点的y
}
DrawNode *pStencil=DrawNode::create();
pStencil->drawPolygon(circle, nCount, green, 0, green);//绘制这个多边形!

//动起来
pStencil->runAction(CCRepeatForever::create(CCSequence::createWithTwoActions(CCScaleBy::create(0.05f, 0.95f),
CCScaleTo::create(0.125f, 1))));
pStencil->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

//设这模板
pClip->setStencil(pStencil);

//添加圆和手的图片
CCSprite*pCircle=CCSprite::create("circle.png");
pCircle->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
pCircle->runAction(CCRepeatForever::create(CCSequence::createWithTwoActions(CCScaleBy::create(0.05f, 0.95f),
CCScaleTo::create(0.125f, 1))));
addChild(pCircle);

CCSprite* pHand=CCSprite::create("hand.png");
pHand->setAnchorPoint(ccp(0.0f,1.0f));
pHand->setPosition(ccp(pCircle->getContentSize().width/2,pCircle->getContentSize().height/2));
pCircle->addChild(pHand);
}

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